Incremental backups fail on archived bulkloaded HFiles FIX (not yet upstream) (apache#202)

Author: hgromer

hbase-backup/src/main/java/org/apache/hadoop/hbase/backup/impl/IncrementalTableBackupClient.java

@@ -197,6 +197,9 @@ private void mergeSplitAndCopyBulkloadedHFiles(List<String> activeFiles,
         int numActiveFiles = activeFiles.size();
         updateFileLists(activeFiles, archiveFiles);
         if (activeFiles.size() < numActiveFiles) {
+          // We've archived some files, delete bulkloads directory
+          // and re-try
+          deleteBulkLoadDirectory();
           continue;
         }